Unlawful presence is 100% of the offenses you'll be able to catch in a Sunnyvale mall parking lot, and it disproves the OPs contention that they are all "criminal, by definition."
You can use ALPR to track people who are known to have entered illegally or who have been sentenced to deportation and are avoiding their sentence. Illegal aliens are criminals.
I really don't think you understand the difference between unlawful presence and improper entry. One of these is a crime while the other is not. Restating your false premise at the end doesn't make it more true; unlawful presence in the U.S. is not a crime, that's a simple fact.
You're missing the point. No one will be caught entering the U.S., with or without a visa, in a Sunnyvale mall parking lot. All you will likely be able to catch is unlawful presence, which is a civil matter and not a crime.
